The EP will be available through topspin.net from June 30th, with all proceeds going to marine conservation charities

The collaboration came about in early 2009, when the two artists were asked to play a benefit concert together at a bookstore in New York. Speaking about how he came to write and record new material with Bjork, David Longstreth from Dirty Projectors said:

"In April 2009, Brandon Stosuy from Stereogum.com asked me if we wanted to play a benefit concert at a bookstore in New York. I said yes. He asked Björk the same thing, and she said yes. Then he asked us if we wanted to collaborate, and we said yes. Björk asked me what we should do, and I said, "I don't know, I guess I'd really love to write a bunch of new songs for us to sing together?" And she said Yes.

"That same month, Amber from Dirty Projectors was walking along a ridge on Mount Wittenberg, north of San Francisco. She was looking out at the ocean and saw a little family of whales, as you sometimes do in April on the Northern California coast. I wrote some songs about it and sent them to Björk, who agreed to sing the part of the mom whale. The songs became Mount Wittenberg Orca. Amber and Angel and Haley sang the part of the kid whales, and I sang the part of Amber. We sang all week long and learned the music just in time to perform it at the bookstore on May 8th."

The artists have released a series of audio-visual trailers to promote the project, which can be viewed below: